Weaver&#39;s knotter



E w m ms V A E W Filed Aug. 11, 1934 lNVENTORI TTOENEYr Patented May 12, 1936 UNITED STATES PATENT OFFICE Application August 11,

7 Claims.

This invention relates to the hand implements used by weavers to tie together threads or ends of the warp. These implements are commonly referred to as weavers knotters, although they .are widely used in operations other than weaving.

The invention aims to improve instruments of this type with a View to facilitatingthe operation of an individual instrument on threads varying substantially in size, and permitting the adjustment of such an instrument to suit the requirements of different threads.

The nature of the invention Will be readily understood from the following description when read in connection with the accompanying drawing, and the novel features will be particularly pointed out in the appended claims.

In the drawing,

Figure 1 is a side elevation of a knotter embodying features of this invention;

Fig. 2 is an end elevation of said instrument, the handle. and thumb piece not being shown; and

Figs. 3, 4, and 5 are side views of individual parts of the instrument shown in Figs. 1 and 2.

The drawing illustrates the invention as embodied in the instrument shown in my British Patent No. 394,220, accepted June 22, 1933, and in my co-pending application Serial No. 694,029,

(since issued as Patent No. 1,974,846, dated September 25, 1934) and reference should be made to this patent or application for a complete description of; the construction and operation of the instrument. For present purposes a very brief description only of the general construction of this knotter is necessary. Most of the parts here illustrated, and which are also shown in the prior patent or application above mentioned, are designated by the same reference numerals there used. The knotter comprises a support H), to which the usual hand strap is secured, and a frame l3 mounted on the support and carrying a pivot stud l2 on which the quadrant I4 is mounted to swing, this quadrant being provided with the usual thumb piece. Meshing with the teeth l6 of the quadrant are the threads of a worm I! on the forward end of which the knotting bill I8 is supported. The threads to be tied together are drawn across the top of the knotter and are guided, respectively, through the slots 41 and 50 at the near side of it, as illustrated in Fig. 1, and into additional slots 3| and 33 at the opposite side. After certain of the k'notting operations have been performed, the arm 36, which is arranged to swing toward and from the bill I 8, is swung away from the latter in order to complete the tying of the knot and to pull the knot 1934, Serial No. 739,437

off the bill, all as explained more completely in the specifications above referred to. During this movement it is desirable to clamp firmly the thread positioned in the slot 47. For this purpose the guard 39 which is secured to the extension 36, Fig. 3, of the arm 36 has a spring hood 39 fastened to it, and one arm 39 of this hood is bent over the inner surface of the extension 36 and lies closely adjacent to its inner side but is normally sprung somewhat away from it. This arm forms one member of the thread clamp. The other member consists of a plate 46, Figs. 1 and 5, integral with the slide 45 which lies just inside the arm 36 and is arranged to move in an approximately horizontal direction toward .and from the member 38'. It is guided during this movement by the pins or studs and BI which extend through the respective slots 62 and 63, Fig. 5, in the slide 45. During the first part of the movement of the quadrant I4 an internal cam on the quadrant acts on the roll 54, which is carried by the lever 53, to lift this lever, and this movement is transmitted through the pin 5| which is secured in the extension 52 of the slide 45 to raise the rearward end of this slide and thus to move its forward end ahead toward the part 39'. At a later point in the cycle of operations of the instrument an external cam 23 on the quadrant engages a roll 64, carried by the part 52 of the slide 45,- and gives the slide its final thread clamping movement. At the same time the cam 23 acting on the roll 64 operates to swing the arm 36 away from the bill l8.

If the threads to be knotted vary substantially in diameter, it is desirable to be able to adjust the relative movements of the clamping members 46 and 39 to accommodate these differences in size. In some cases this is desirable because of the added pressure required to enable the instrument properly to perform its functions, while in other cases it is of advantage in adjusting the clamping pressure to the requirements of delicate yarns or other characteristics of individual threads. The present invention provides an arrangement which permits adjustment of the thread clamp so that it can be made to exert substantially the same degree of pressure on threads of different sizes, or its pressure may be varied to suit the requirements of difierent threads or yarns.

In the arrangement shown a lever 65, Figs. 1 and 4, is fulcrumed at 66 on the hinge piece 61 which is riveted or otherwise secured rigidly to the frame l3 of the instrument. The stud 6|, previously mentioned, is secured rigidly to this lever so that it is carried by and moves with it, the lever having a hole 68 through which the end of the stud projects. Usually this stud is provided with a shoulder to bear against the inner face of the lever, and the reduced portion of it which projects through the hole 68 is riveted over it at its outer end. An arm extending laterally from this lever and forming an integral part of it, is provided with a slot 10 through which the shank of a screw 1| projects, this screw being threaded into the hinge piece 61.

With this explanation it will be evident from an inspection of Fig. 1 that if the screw H is loosened and the lever is swung toward the right, this movement Will be transmitted through the stud Bl to the slide 45 and will adjust this slide into such a position as to partially close the slot 41. A movement of the lever in the opposite direction will widen said slot. These adjustments thus will change slightly the initial relationship of the slide to its operating mechanism. As above indicated, such an adjustment can be utilized to enable the instrument to handle threads differing substantially in size or to vary the pressure exerted on the thread immediately prior to initiating the swinging movement of the arm. Preferably the lever 65 is provided with a pointer 12 which cooperates with graduations stamped on the side of the arm 36 to designate the different degrees of adjustment of the lever. When the desired adjustment has been made the screw H is tightened up to hold the parts in their new relationship. 7

The invention thus provides an arrangement which is convenient to use and which permits the operator to adjust the clamping pressure to suit the requirements of difierent sizes-and qualities of yarn or thread.

While I have herein shown and described a preferred embodiment of my invention, it will be understood that the invention may be embodied in other forms without departing from the spirit or scope thereof.

Having thus described my invention, What I desire to claim as new is:

1. In a weavers knotter, the combination with knotting instrumentalities including members for clamping the thread at one side of the knotter, of mechanism for relatively moving said members to grip the thread at substantially a predetermined point in the cycle of operations of the knotter, said members being relatively adjustable to accommodate different sizes of thread, and means for securing said parts in their different positions of relative adjustment.

2. In a weavers knotter, the combination with knotting instrumentalities including members for clamping the thread at one side of the knotter, of mechanism for relatively moving said members to grip the thread at substantially a predetermined point in the cycle of operations of the knotter, said members being relatively adjustable to accommodate different sizes of thread, and an indicator for designating difierent degrees of said adjustment.

3. In a weavers knotter, the combination with knotting instrumentalities including members for clamping the thread at one side of the knotter, of mechanism for giving one of said members a thread clamping movement during the cycle of operations of the instrument, and means adjustable to vary and set the initial relationship of the latter member to its cooperating thread clamping member.

4. In a weavers knotter, the combination with knotting instrumentalities including a relatively stationary part at the forward end of the instrument and a slide movable toward and from said part to clamp a thread against it, of mechanism for operating said slide at substantially a predetermined point in the cycle of operations of the instrument, and means adjustable to vary and set the relationship of said slide to its operating mechanism.

5. In a weavers knotter, the combination with knotting instrumentalities including a swinging arm and thread clamping members carried by said arm, of mechanism for relatively moving said members to grip the thread at substantially a predetermined point in the cycle of operations of the instrument, and means adjustable to vary and set, at will, the extent of the relative movement so imparted to said members.

6. In a weavers knotter, the combination with knotting instrumentalities including a relatively stationary part at the forward end of the instrument and a slide movable toward and from said part to clamp a thread against it, of mechanism for operating said slide at substantially a predetermined point in the cycle of operations of the instrument, means adjustable to vary and set the relationship of said slide to its operating mechanism, and means arranged to be operated by such adjustment to indicate the degree of variation so produced in said relationship.

7. In a weavers knotter, the combination with knotting instrumentalities including a relatively stationary part at the forward end of the instrument and a slide movable toward and from said part to clamp a thread against it, of mechanism for operating said slide at substantially a predetermined point in the cycle of operations of the instrument, a lever carried by said instrument and connected by said slide to adjust it relatively to said operating mechanism, and means for securing said lever in different positions of adjustment.

' NORMAN COOK. 

